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161.
The activity of calcium in calcium-metal-fluoride fluxes 总被引:1,自引:0,他引:1
Yuichiro Ochifuji Fumitaka Tsukihashi Nobuo Sano 《Metallurgical and Materials Transactions B》1995,26(4):789-794
The standard Gibbs energy of reaction Ca (1) +O (mass pct, in Zr) = CaO (s) has been determined as follows by equilibrating molten calcium with solid zirconium in a CaO
crucible: ΔG° = -64,300(±700) + 19.8(±3.5)T J/mol (1373 to 1623 K) The activities of calcium in the CaOsatd-Ca-MF2 (M: Ca, Ba, Mg) and CaOsatd-Ca-NaF systems were measured as a function of calcium composition at high calcium contents at 1473 K on the basis of the
standard Gibbs energy. The activities of calcium increase in the order of CaF2, BaF2, and MgF2 at the same calcium fraction of these fluxes. The observed activities are compared with those estimated by using the Temkin
model for ionic solutions. Furthermore, the possibility of the removal of tramp elements such as tin, arsenic, antimony, bismuth,
and lead from carbon-saturated iron by using calcium-metal-fluoride fluxes is discussed.
Formerly Graduate Student, Department of Metallurgy, The University of Tokyo. 相似文献
162.
Yoshihito Kato Setsuro Hiraoka Shogo Fukumoto Yutaka Tada Yuichiro Nagatsu Ryushin Ohmasa Sung Tae Koh Young Sei Lee 《Korean Journal of Chemical Engineering》2010,27(1):1-5
The mixing performance of a new type of mixing equipment which has several fin oscillators on a pair of shafts with a vibrating
motor was investigated. This mixing equipment, which is mainly used for industrial plating processes, was usually operated
at a vibrating frequency of about 40 Hz with the amplitude 1 mm. The flow visualization in this equipment showed that the
flow in the vessel at laminar flow region was vertically divided into two distinct symmetric regions. The numerical simulation
of the flow and the mixing patterns agreed well with the visualization result at laminar flow region. 相似文献
163.
164.
Takayuki Kanda Masayuki Kamasima Michita Imai Tetsuo Ono Daisuke Sakamoto Hiroshi Ishiguro Yuichiro Anzai 《Autonomous Robots》2007,22(1):87-100
This paper reports the findings for a humanoid robot that expresses its listening attitude and understanding to humans by
effectively using its body properties in a route guidance situation. A human teaches a route to the robot, and the developed
robot behaves similar to a human listener by utilizing both temporal and spatial cooperative behaviors to demonstrate that
it is indeed listening to its human counterpart. The robot's software consists of many communicative units and rules for selecting
appropriate communicative units. A communicative unit realizes a particular cooperative behavior such as eye-contact and nodding,
found through previous research in HRI. The rules for selecting communicative units were retrieved through our preliminary
experiments with a WOZ method. An experiment was conducted to verify the effectiveness of the robot, with the results revealing
that a robot displaying cooperative behavior received the highest subjective evaluation, which is rather similar to a human
listener. A detailed analysis showed that this evaluation was mainly due to body movements as well as utterances. On the other
hand, subjects' utterance to the robot was encouraged by the robot's utterances but not by its body movements. 相似文献
165.
Sohshi Morimura Makoto Sugaya Tomonori Oka Hiraku Suga Tomomitsu Miyagaki Yuichiro Tsunemi Yoshihide Asano Shinichi Sato 《International journal of molecular sciences》2021,22(4)
The incidence of cancers in atopic dermatitis (AD) is not increased, although the Th2-dominant environment is known to downregulate tumor immunity. To gain mechanistic insights regarding tumor immunity in AD, we utilized CCL17 transgenic (TG) mice overexpressing CCL17, which is a key chemokine in AD. Tumor formation and lung metastasis were accelerated in CCL17 TG mice when melanoma cells were injected subcutaneously or intravenously. Flow cytometric analysis showed increases in regulatory T cells (Tregs) in lymph nodes in CCL17 TG mice with high mRNA levels of IL-10 and Foxp3 in tumors, suggesting that Tregs attenuated tumor immunity. The frequency of myeloid-derived suppressor cells (MDSCs), however, was significantly decreased in tumors of CCL17 TG mice, suggesting that decreased MDSCs might promote tumor immunity. Expression of CXCL17, a chemoattractant of MDSCs, was decreased in tumors of CCL17 TG mice. Depletion of Tregs by the anti-CD25 antibody markedly reduced tumor volumes in CCL17 TG mice, suggesting that tumor immunity was accelerated by the decrease in MDSCs in the absence of Tregs. Thus, CCL17 attenuates tumor immunity by increasing Tregs and Th2 cells, while it decreases MDSCs through reductions in CXCL17, which may work as a “safety-net” to reduce the risk of malignant tumors in the Th2-dominant environment. 相似文献
166.
In this paper, we describe an intelligent location-aware city guide system, which adapts to each user’s preferences, and uses
an intuitive “metal detector” interface for navigation. Our system analyzes each user’s past location data history to estimate
individual preferences, and allows users to find shops that match their tastes in the same way a metal detector would be used
to detect metal objects. The procedure with which the system picks out shops that match each user’s preferences includes a
newly developed place learning algorithm, which can efficiently find frequented places, complete with their proper names (e.g.
“The Ueno Royal Museum”). We have conducted a series of evaluation tests at a popular shopping district inside Tokyo, and
the results validate the effectiveness of our overall approach. 相似文献
167.
Satoshi Kawamura Daisuke Tanaka Taisuke Tanaka Daisuke Noguchi Yuichiro Hayakawa Minami Kaneko Ken Saito Fumio Uchikoba 《Artificial Life and Robotics》2018,23(3):380-386
In this paper, we will compare the walking behavior of quadruped and hexapod walking MEMS robots. These robots are fabricated by connecting same modules, which are composed of a couple of independent leg mechanisms. Independent leg mechanisms can actuate the single leg by a single artificial muscle wire. The neural networks IC that mimics real living organisms controls the mechanical systems. The length and weight of the quadruped MEMS robot were 7.2 mm and 95.8 mg, respectively. The quadruped robot showed the walking speed of 24.6 mm/min. The robot tended to lose its balance and the weight balance is quite important for the moving quadruped. On the other hand, the length and weight of the hexapod MEMS robot were 9.0 mm and 162 mg, respectively. The hexapod robot showed stable walking. The speed was 27.0 mm/min. 相似文献
168.
Takamasa Iio Ryota Maeda Kohei Ogawa Yuichiro Yoshikawa Hiroshi Ishiguro Kaori Suzuki Tomohiro Aoki Miharu Maesaki Mika Hama 《Journal of Computer Assisted Learning》2019,35(2):228-245
This paper reports how robot‐assisted language learning (RALL) impacts Japanese adults' English speaking skills. With existing research on RALL focusing on children, there is little evidence indicating RALL's effects on adults. We developed a RALL system comprising a robot, a tablet, and designed learning materials for speaking practice. To explore the effects of this system on the speaking skills of adults, we conducted a pretest and posttest designed pilot experiment. The participants in this study were nine female Japanese university students. The participants used the system for speaking practice for a total of 30 min per day for 7 days. The results of comparing the pretests with the posttests demonstrated that the adults' English speaking skills were enhanced; in particular, their speaking accuracy, fluency, and pronunciation improved greatly. This study contributes to providing clear evidence of the effects of RALL on Japanese adults' English speaking skills. 相似文献
169.
Determination of peroxide value by the colorimetric iodine method with protection of iodide as cadmium complex 总被引:1,自引:0,他引:1
Improved procedures of the Swoboda and Lea method for the determination of peroxide values (POV) of fats and lipids are presented.
After oxidation of iodide to iodine with the sample for 5 min under an inert atmosphere, an excess of the iodide ion is immediately
converted to cadmium complex for protection from atmospheric oxygen. The iodine is measured colorimetrically at 358 or 410
nm, and POV is calculated from the absorbance. This method permits the rapid determination of POV with a small amount of sample
at a moderate cost using usual glasswares. For the analysis of lipids in biological materials or food products, the chloroform
solution obtained by the Bligh and Dyer method is directly subjected to this procedure without evaporation of the solvent.
Conversions between POV obtained by the different methods are discussed. 相似文献
170.
Efficient Room‐Temperature Phosphorescence from Organic–Inorganic Hybrid Perovskites by Molecular Engineering
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Hongwei Hu Fabian Meier Daming Zhao Yuichiro Abe Yang Gao Bingbing Chen Teddy Salim Elbert E. M. Chia Xianfeng Qiao Carsten Deibel Yeng Ming Lam 《Advanced materials (Deerfield Beach, Fla.)》2018,30(36)
Solution‐processed organic–inorganic hybrid perovskites are promising emitters for next‐generation optoelectronic devices. Multiple‐colored, bright light emission is achieved by tuning their composition and structures. However, there is very little research on exploring optically active organic cations for hybrid perovskites. Here, unique room‐temperature phosphorescence from hybrid perovskites is reported by employing novel organic cations. Efficient room‐temperature phosphorescence is activated by designing a mixed‐cation perovskite system to suppress nonradiative recombination. Multiple‐colored phosphorescence is achieved by molecular design. Moreover, the emission lifetime can be tuned by varying the perovskite composition to achieve persistent luminescence. Efficient room‐temperature phosphorescence is demonstrated in hybrid perovskites that originates from the triplet states of the organic cations, opening a new dimension to the further development of perovskite emitters with novel functional organic cations for versatile display applications. 相似文献